Look at:
**broken link removed**
New chip from REDUX:
The StelaGate RS-160 is a single chip solution for point-to-point tunneling of unstructured E1/T1/J1 over Ethernet-based and HDLC-based packet links.
The RS-160 provides:
Packetization of an E1/T1/J1 circuit transparent to the TDM signaling
Transmission of packetized E1/T1/J1 over any 10/100 Ethernet link or HDLC packet service link
On-chip clock recovery
Packet re-ordering
Bridging and multiplexing of 10/100 Ethernet together with packetized TDM circuit over packet service link